Synchronous thread demolding mold

Abstract

The invention relates to the technical field of injection molds, and particularly provides a synchronous thread demolding mold which comprises a fixed mold structure, a movable mold structure and a demolding mechanism, and an injection molding cavity is formed between the fixed mold structure and the movable mold structure; the movable mold structure comprises a push plate, and an injection product formed in the injection molding cavity in an injection molding mode is located on the push plate. The demolding mechanism comprises a driving assembly, a linkage assembly and a threaded core, the threaded core extends into the injection molding cavity, and the driving assembly is used for driving the threaded core to rotate; the linkage assembly is connected with the driving assembly, the linkage assembly comprises a linkage plate, and the driving assembly is used for driving the threaded core to rotate and driving the linkage plate in the linkage assembly to move at the same time; and the linkage plate is movably connected with the push plate, and horizontal movement is converted into vertical movement of the push plate through the inclined surface of the linkage plate, so that an injection molding product is ejected out while the thread core rotates to retreat teeth, synchronous demolding is realized, and threads of the product are effectively protected.

Description

Technical Field

[0001] This invention belongs to the field of injection mold technology, and specifically relates to a synchronous thread demolding mold. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of injection molding include high production speed and efficiency, automated operation, the ability to produce shapes ranging from simple to complex, sizes from large to small, precise product dimensions, easy product updates and replacements, and the ability to create complex-shaped parts. Injection molding is suitable for mass production and molding of complex-shaped products. The injection mold is the key component in injection molding.

[0003] Some injection-molded products have internal threads, requiring the use of threaded molds. For example, an oil can handle cap includes a handle and a cap body, with internal threads designed into the cap body. Traditional threaded mold demolding typically uses a motor-driven sprocket to rotate the plastic part, which is then loosened and ejected by a spring-driven ejector plate. This demolding method cannot accurately position the start and end points of the threads. Alternatively, a hydraulic cylinder, rack, and gear combination can be used to drive the thread core to unscrew, which can easily damage the threads on the injection-molded product. Summary of the Invention

[0004] I. Technical problems to be solved This invention addresses the aforementioned deficiencies in existing technologies by proposing a synchronous thread demolding mold, which solves the problem that thread damage is easily caused during demolding in existing thread molds.

[0005] II. Technical Solution To solve the above-mentioned technical problems, the present invention provides a synchronous threaded demolding mold, including a fixed mold structure, a moving mold structure, and a demolding mechanism, wherein an injection cavity is formed between the fixed mold structure and the moving mold structure; the moving mold structure includes a push plate, and the injection-molded product in the injection cavity is located on the push plate; the demolding mechanism includes a drive assembly, a linkage assembly, and a threaded core, the threaded core extending into the injection cavity, and the drive assembly driving the threaded core to rotate; the linkage assembly is connected to the drive assembly, and the linkage assembly includes a linkage plate, the linkage plate being movably connected to the push plate, and the drive assembly driving the linkage plate to move, so that the linkage plate pushes the push plate to move, thereby pushing the injection-molded product off the threaded core.

[0006] During demolding after injection molding, the injection molding machine drives the moving mold structure and the demolding mechanism to move downwards together. After moving to the appropriate position, the drive assembly operates, driving the linkage plate to move horizontally, so that the linkage plate pushes the push plate to move vertically. Since the injection molded product is located on the push plate, an upward force is applied to the injection molded product. At the same time, the drive assembly drives the threaded core to rotate. Since the injection molded product is an oil can handle cover, its special structure allows it to be circumferentially engaged with the moving mold structure and can move relative to the axial direction. Before the threaded core rotates, the oil can handle cover is located on the moving mold structure. When the threaded core rotates, on the one hand, the threaded core is demolded by unthreading, and on the other hand, the oil can handle cover is pushed upwards by the linkage plate moving horizontally, and gradually comes off the threaded core. During the demolding process, the external thread of the threaded core forms an internal thread on the inner surface of the injection molded product in the injection cavity.

[0007] Preferably, the moving direction of the linkage plate is a first direction, and the upper surface of the linkage plate is an inclined surface. When the inclined surface moves with the linkage plate in the first direction, it pushes the push plate to move in the second direction.

[0008] Specifically, the first direction is the X-axis direction in the diagram, which is the horizontal direction, and the second direction is the Z-axis direction, which is the vertical direction.

[0009] Preferably, the linkage component further includes a linkage roller, and the lower end of the push plate is provided with a linkage roller opposite to the inclined surface, the linkage roller being used to roll on the inclined surface.

[0010] Specifically, the inclined surface is inclined upward from left to right in the figure, the lower end of the push plate is provided with a roller groove, the linkage roller is installed in the roller groove and partially extends out from the lower end of the roller groove to roll in cooperation with the inclined surface.

[0011] Preferably, the linkage assembly further includes a linkage rod, and the linkage plate is fixed to the linkage rod; the drive assembly includes a hydraulic cylinder, and one end of the linkage rod is connected to the movable end of the hydraulic cylinder.

[0012] Specifically, the drive assembly further includes a cylinder fixing plate, through which the cylinder is fixed to one side of the moving template of the moving mold structure.

[0013] Preferably, two linkage plates are arranged sequentially along the length of the linkage rod, and the inclined surfaces of the two linkage plates are arranged in parallel; correspondingly, two linkage rollers are also arranged, and the linkage rollers are used to roll from the lower end of the inclined surface to the higher end.

[0014] Specifically, the movable end of the hydraulic cylinder is provided with a connecting plate, and there are two linkage rods arranged in parallel on the connecting plate. Correspondingly, the linkage rollers are also provided with two sets that are respectively opposite to the linkage plates on the two linkage rods.

[0015] Preferably, the moving mold structure includes a moving template, on which an installation groove is provided. The installation groove extends through the moving template along the moving direction of the linkage rod. The linkage rod and the linkage plate move within the installation groove, and the linkage roller is used to extend into the installation groove and contact the inclined surface.

[0016] Preferably, when the linkage rod and the linkage plate are located in the mounting groove, the higher end of the inclined surface is flush with the upper opening of the mounting groove.

[0017] Preferably, the drive assembly further includes a rack, a first gear, a second gear, and a third gear. The movable end of the cylinder is connected to the rack, the rack meshes with the first gear, the second gear is coaxially arranged with the first gear, and the third gear meshes with the second gear. The threaded core is connected to the third gear.

[0018] Preferably, the threaded core has an inner groove extending through it along its axial direction, and a moving mold insert is provided in the inner groove. The upper end of the moving mold insert extends from the upper end of the inner groove to protrude from the threaded core, and the lower end of the moving mold insert is used to fix it in the moving mold structure.

[0019] Preferably, the fixed mold structure includes a fixed template and a fixed mold core disposed within the fixed template; the moving mold structure further includes a moving mold core and a mounting base, the moving mold core being located within the moving template, the moving template being located on the mounting base, a mounting hole being provided through the middle of the moving mold core, the upper end of the threaded core extending from the mounting hole to between the fixed mold core and the moving mold core, and the threaded end of the threaded core, the upper end of the moving mold insert, the fixed mold core, and the moving mold core forming the injection cavity.

[0020] Specifically, the moving mold insert extends between the moving mold core and the fixed mold core, and the moving mold insert is circumferentially rotatable with the inner groove.

[0021] III. Beneficial Effects 1. Compared with the prior art, in this invention, after injection molding is completed, during demolding, the injection molding machine drives the moving mold structure and the demolding mechanism to move downwards together. After moving to the appropriate position, the drive assembly works, driving the linkage plate to move horizontally, so that the linkage plate pushes the push plate to move vertically. Since the injection molded product is located on the push plate, an upward force is applied to the injection molded product. At the same time, the drive assembly drives the threaded core to rotate. Since the injection molded product is an oil can handle cover, its special structure allows it to achieve circumferential engagement on the moving mold structure and relative axial movement. Before the threaded core rotates, the oil can handle cover is located on the moving mold structure. When the threaded core rotates, on the one hand, the threaded core unwinds and disengages. On the one hand, the oil can handle cover is pushed upward by the linkage plate moving horizontally, and gradually withdraws from the threaded core. During the withdrawal process, the external thread of the threaded core forms an internal thread on the inner surface of the injection molded product in the injection cavity. This structure uses a drive component to drive the threaded core and the linkage plate simultaneously, realizing the action of simultaneously reaming the thread and pushing the plate out. Not only is the structure relatively simple, which helps to reduce production costs, but also the synchronous demolding ensures the accuracy of the starting position of the product thread. It solves industry pain points such as easy damage to the product tail thread, easy damage to the thread sleeve, and seizing. It can effectively prevent the thread from being damaged, which helps to improve the thread quality, that is, improve the quality of the injection molded product.

[0022] 2. Compared with the prior art, in this invention, when the inclined surface moves horizontally with the linkage plate, the inclined surface acts on the push plate. As the horizontal travel increases, the vertical travel of the push plate also increases, thereby driving the injection molded product on the push plate upward. That is, the inclined surface converts horizontal movement into vertical movement. Before demolding, the linkage roller is located at the lower end of the inclined surface. During demolding, the drive assembly drives the linkage plate to move horizontally, and the linkage roller rolls from the lower end of the inclined surface to the higher end. During this process, the linkage roller gradually moves upward, driving the push plate upward, and thus driving the injection molded product on the push plate upward. The linkage roller and the linkage plate cooperate. On the one hand, the linkage roller extends from the lower end of the push plate to contact the linkage plate and is pushed upward by the horizontal movement of the linkage plate. On the other hand, the rolling cooperation between the linkage roller and the inclined surface helps to reduce friction, allowing the horizontal movement of the linkage plate and the vertical movement of the push plate to proceed smoothly, avoiding jamming that could damage the threads during demolding. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the synchronous thread demolding mold of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of the synchronous thread demolding mold of the present invention. Figure 1 ; Figure 3This is a schematic diagram of the overall cross-sectional structure of the synchronous thread demolding mold of the present invention. Figure 2 ; Figure 4 For the present invention Figure 3 Enlarged view of a portion of point A in the middle; Figure 5 This is a schematic diagram of the demolding mechanism and push plate cooperation structure of the present invention.

[0024] In the diagram: 1 Fixed mold structure, 10 Injection cavity, 11 Fixed template, 12 Fixed mold core, 2 Moving mold structure, 20 Push plate, 21 Moving template, 22 Mounting groove, 23 Moving mold insert, 24 Mounting base, 25 Mounting hole, 26 Moving mold core, 3 Demolding mechanism, 31 Drive assembly, 311 Hydraulic cylinder, 312 Rack, 313 First gear, 314 Second gear, 315 Third gear, 316 Connecting plate, 317 Hydraulic cylinder fixing plate, 32 Linkage assembly, 321 Linkage plate, 322 Inclined surface, 323 Linkage roller, 324 Linkage rod, 33 Threaded core, 331 Inner groove, 332 Threaded end, 4 Injection molded product, 41 Handle, 42 Cover, 43 Oil can nozzle. Detailed Implementation

[0025] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] It should be noted that in the XYZ coordinate system provided in this article, the positive direction of the X-axis represents the right, and the negative direction of the X-axis represents the left; the positive direction of the Y-axis represents the rear, and the negative direction of the Y-axis represents the front; the positive direction of the Z-axis represents the top, and the negative direction of the Z-axis represents the bottom. The meanings of the Z-axis, X-axis, and Y-axis are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Example

[0028] like Figures 1-5As shown, a synchronous threaded demolding mold includes a fixed mold structure 1, a moving mold structure 2, and a demolding mechanism 3. An injection cavity 10 is formed between the fixed mold structure 1 and the moving mold structure 2. The moving mold structure 2 includes a push plate 20, on which an injection-molded product 4 is located. The demolding mechanism 3 includes a drive assembly 31, a linkage assembly 32, and a threaded core 33. The threaded core 33 extends into the injection cavity 10, and the drive assembly 31 drives the threaded core 33 to rotate. The linkage assembly 32 is connected to the drive assembly 31 and includes a linkage plate 321, which is movably connected to the push plate 20. The drive assembly 31 drives the linkage plate 321 to move, thereby pushing the push plate 20 to move and push the injection-molded product 4 off the threaded core 33.

[0029] Specifically, the injection-molded product 4 in this application is an oil can handle cover, which includes a handle 41 and a cover body 42. During demolding after injection molding, the injection molding machine drives the moving mold structure 2 and the demolding mechanism 3 to move downwards together. After moving to a suitable position, the drive assembly 31 operates, driving the linkage plate 321 to move horizontally, so that the linkage plate 321 pushes the push plate 20 to move vertically. Since the injection molded product 4 is located on the push plate 20, an upward force is applied to the injection molded product 4. At the same time, the drive assembly 31 drives the threaded core 33 to rotate. Since the injection molded product 4 is an oil can handle cover, its special structure allows it to be circumferentially engaged on the moving mold structure 2 and can move relative to the axial direction. Before the threaded core 33 rotates, the oil can handle cover is located on the moving mold structure 2. When the threaded core 33 rotates, one side... While the threaded core 33 is being demolded, the oil can handle cover is pushed upward by the linkage plate 321 as it moves horizontally, gradually withdrawing from the threaded core 33. During this withdrawal process, the external thread of the threaded core 33 forms an internal thread on the inner surface of the injection molded product 4 within the injection cavity 10. This structure utilizes the drive assembly 31 to simultaneously drive the threaded core 33 and the linkage plate 321, achieving simultaneous threading and ejection. This not only simplifies the structure and reduces production costs, but also ensures the accuracy of the product's thread starting position due to synchronous demolding. It solves industry pain points such as easy damage to the product's tail thread, easy damage to the thread sleeve, and seizing, effectively preventing thread damage and improving thread quality, thus enhancing the quality of the injection molded product 4.

[0030] like Figure 2 and Figure 5As shown, preferably, the moving direction of the linkage plate 321 is the first direction, and the upper surface of the linkage plate 321 is an inclined surface 322. When the inclined surface 322 moves with the linkage plate 321 in the first direction, it pushes the push plate 20 to move in the second direction.

[0031] Specifically, the first direction is the X-axis direction in the diagram, which is the horizontal direction, and the second direction is the Z-axis direction, which is the vertical direction.

[0032] In this embodiment, when the inclined surface 322 moves horizontally along with the linkage plate 321, the inclined surface 322 acts on the push plate 20. As the horizontal movement increases, the vertical movement of the push plate 20 increases, thereby driving the injection molded product 4 on the push plate 20 to move upward. That is, the setting of the inclined surface 322 converts horizontal movement into vertical movement. The upward movement of the injection molded product 4 can achieve the effect of demolding with a simple structure, which helps to reduce production costs.

[0033] like Figure 2 As shown, preferably, the linkage component 32 further includes a linkage roller 323. The lower end of the push plate 20 is provided with a linkage roller 323 opposite to the inclined surface 322. The linkage roller 323 is used to roll on the inclined surface 322.

[0034] Specifically, the inclined surface 322 is inclined upward from left to right in the figure, the lower end of the push plate 20 is provided with a roller groove, and the linkage roller 323 is installed in the roller groove and partially extends out from the lower end of the roller groove to roll in cooperation with the inclined surface 322.

[0035] Before demolding, the linkage roller 323 is located at the lower end of the inclined surface 322. During demolding, the drive assembly 31 drives the linkage plate 321 to move horizontally, and the linkage roller 323 rolls from the lower end of the inclined surface 322 to the higher end of the inclined surface 322. During this process, the linkage roller 323 gradually moves upward, driving the push plate 20 to move upward, and then driving the injection molded product 4 on the push plate 20 to move upward. In this structure, the linkage roller 323 and the linkage plate 321 cooperate. On the one hand, the linkage roller 323 extends from the lower end of the push plate 20 to contact the linkage plate 321 and is pushed upward by the horizontal movement of the linkage plate 321. On the other hand, the linkage roller 323 rolls with the inclined surface 322, which helps to reduce friction and allows the horizontal movement of the linkage plate 321 and the vertical movement of the push plate 20 to proceed smoothly, avoiding jamming and damage to the threads during demolding.

[0036] like Figure 2 As shown, preferably, the linkage component 32 further includes a linkage rod 324, and the linkage plate 321 is fixed on the linkage rod 324; the drive component 31 includes a hydraulic cylinder 311, and one end of the linkage rod 324 is connected to the movable end of the hydraulic cylinder 311.

[0037] Specifically, the drive assembly 31 further includes a cylinder fixing plate 317, and the cylinder 311 is fixed to one side of the moving template 21 of the moving template structure 2 by the cylinder fixing plate 317.

[0038] During demolding, the hydraulic cylinder 311 drives the threaded core 33 to rotate, and at the same time, the movable end of the hydraulic cylinder 311 moves horizontally, driving the linkage rod 324 to move, thereby driving the linkage plate 321 to move in the horizontal direction.

[0039] like Figure 2 As shown, preferably, two linkage plates 321 are arranged sequentially along the length direction of the linkage rod 324, and the inclined surfaces 322 of the two linkage plates 321 are arranged in parallel; correspondingly, two linkage rollers 323 are also arranged, and the linkage rollers 323 are used to roll from the lower end of the inclined surface 322 to the higher end.

[0040] Specifically, the movable end of the hydraulic cylinder 311 is provided with a connecting plate 316, and two linkage rods 324 are provided. The two linkage rods 324 are arranged in parallel on the connecting plate 316. Correspondingly, the linkage rollers 323 are also provided with two sets of linkage plates 321 respectively opposite to the two linkage rods 324.

[0041] The linkage plate 321 is provided in two parts, and correspondingly, the linkage roller 323 is also provided in two parts. This structure can ensure that when the linkage plate 321 moves, the two linkage rollers 323 move synchronously, so that the left and right sides of the push plate 20 can move upward smoothly at the same time, avoiding the tilting or displacement of the push plate 20 and affecting the tilting of the injection molded product 4 on the push plate 20, which helps to avoid damage to the threads on the injection molded product 4.

[0042] like Figures 2-3 As shown, preferably, the moving mold structure 2 includes a moving template 21, on which an installation groove 22 is provided. The installation groove 22 passes through the moving template 21 along the moving direction of the linkage rod 324. The linkage rod 324 and the linkage plate 321 move within the installation groove 22. The linkage roller 323 is used to extend into the installation groove 22 and contact the inclined surface 322.

[0043] Specifically, when the linkage roller 323 extends into the mounting groove 22 and contacts the lower end of the inclined surface 322, the lower end surface of the push plate 20 fits against the upper end surface of the moving template 21, which helps to ensure a tight fit of the mold and thus improves the quality of the injection molded product 4.

[0044] During demolding, the hydraulic cylinder 311 drives the threaded core 33 to rotate, and simultaneously drives the linkage rod 324 and the linkage plate 321 to move within the mounting groove 22, so as to cooperate with the linkage roller 323 to drive the push plate 20 and the injection molded product 4 to move upward. In this structure, the mounting groove 22 provides space for the movement of the linkage rod 324 and the linkage plate 321, so as to facilitate the tight fit of the mold components.

[0045] like Figure 2 As shown, preferably, when the linkage rod 324 and the linkage plate 321 are located in the mounting groove 22, the higher end of the inclined surface 322 is flush with the upper opening of the mounting groove 22.

[0046] When the linkage roller 323 extends into the mounting groove 22 and contacts the lower end of the inclined surface 322, the higher end of the inclined surface 322 is flush with the upper opening of the mounting groove 22, causing the lower end face of the push plate 20 to fit against the upper end face of the moving template 21. This structure helps to ensure a tight fit of the mold, thereby improving the quality of the injection molded product 4. Example

[0047] like Figures 1-5 As shown, a synchronous threaded demolding mold includes a fixed mold structure 1, a moving mold structure 2, and a demolding mechanism 3. An injection cavity 10 is formed between the fixed mold structure 1 and the moving mold structure 2. The moving mold structure 2 includes a push plate 20, on which an injection-molded product 4 is located. The demolding mechanism 3 includes a drive assembly 31, a linkage assembly 32, and a threaded core 33. The threaded core 33 extends into the injection cavity 10, and the drive assembly 31 drives the threaded core 33 to rotate. The linkage assembly 32 is connected to the drive assembly 31 and includes a linkage plate 321, which is movably connected to the push plate 20. The drive assembly 31 drives the linkage plate 321 to move, thereby pushing the push plate 20 to move and push the injection-molded product 4 off the threaded core 33.

[0048] During demolding after injection molding, the injection molding machine drives the moving mold structure 2 and the demolding mechanism 3 to move downwards together. After moving to the appropriate position, the drive assembly 31 operates, driving the linkage plate 321 to move horizontally, so that the linkage plate 321 pushes the push plate 20 to move vertically. Since the injection molded product 4 is located on the push plate 20, an upward force is applied to the injection molded product 4. At the same time, the drive assembly 31 drives the threaded core 33 to rotate. Since the injection molded product 4 is an oil can handle cover, its special structure... This allows it to be circumferentially engaged and relatively axially movable on the moving mold structure 2. Before the threaded core 33 rotates, the oil can handle cover is located on the moving mold structure 2. When the threaded core 33 rotates, on the one hand, the threaded core 33 is de-threaded and demolded, and on the other hand, the oil can handle cover is pushed upward by the linkage plate 321 moving horizontally, and gradually withdraws from the threaded core 33. During the withdrawal process, the external thread of the threaded core 33 forms an internal thread on the inner surface of the injection molded product 4 in the injection cavity 10.

[0049] like Figure 2 As shown, preferably, the moving direction of the linkage plate 321 is the first direction, and the upper surface of the linkage plate 321 is an inclined surface 322. When the inclined surface 322 moves with the linkage plate 321 in the first direction, it pushes the push plate 20 to move in the second direction.

[0050] Specifically, the first direction is the X-axis direction in the diagram, which is the horizontal direction, and the second direction is the Z-axis direction, which is the vertical direction.

[0051] In this embodiment, when the inclined surface 322 moves horizontally along with the linkage plate 321, the inclined surface 322 acts on the push plate 20. As the horizontal movement increases, the vertical movement of the push plate 20 increases, thereby driving the injection molded product 4 on the push plate 20 to move upward. That is, the setting of the inclined surface 322 converts horizontal movement into vertical movement. The upward movement of the injection molded product 4 can achieve the effect of demolding with a simple structure, which helps to reduce production costs.

[0052] like Figure 2 As shown, preferably, the linkage component 32 further includes a linkage roller 323. The lower end of the push plate 20 is provided with a linkage roller 323 opposite to the inclined surface 322. The linkage roller 323 is used to roll on the inclined surface 322.

[0053] Specifically, the inclined surface 322 is inclined upward from left to right in the figure, the lower end of the push plate 20 is provided with a roller groove, and the linkage roller 323 is installed in the roller groove and partially extends out from the lower end of the roller groove to roll in cooperation with the inclined surface 322.

[0054] Before demolding, the linkage roller 323 is located at the lower end of the inclined surface 322. During demolding, the drive assembly 31 drives the linkage plate 321 to move horizontally, and the linkage roller 323 rolls from the lower end of the inclined surface 322 to the higher end of the inclined surface 322. During this process, the linkage roller 323 gradually moves upward, driving the push plate 20 to move upward, and then driving the injection molded product 4 on the push plate 20 to move upward. In this structure, the linkage roller 323 and the linkage plate 321 cooperate. On the one hand, the linkage roller 323 extends from the lower end of the push plate 20 to contact the linkage plate 321 and is pushed upward by the horizontal movement of the linkage plate 321. On the other hand, the linkage roller 323 rolls with the inclined surface 322, which helps to reduce friction and allows the horizontal movement of the linkage plate 321 and the vertical movement of the push plate 20 to proceed smoothly, avoiding jamming and damage to the threads during demolding.

[0055] like Figure 2 As shown, preferably, the linkage component 32 further includes a linkage rod 324, and the linkage plate 321 is fixed on the linkage rod 324; the drive component 31 includes a hydraulic cylinder 311, and one end of the linkage rod 324 is connected to the movable end of the hydraulic cylinder 311.

[0056] Specifically, the drive assembly 31 further includes a cylinder fixing plate 317, and the cylinder 311 is fixed to one side of the moving template 21 of the moving template structure 2 by the cylinder fixing plate 317.

[0057] During demolding, the hydraulic cylinder 311 drives the threaded core 33 to rotate, and at the same time, the movable end of the hydraulic cylinder 311 moves horizontally, driving the linkage rod 324 to move, thereby driving the linkage plate 321 to move in the horizontal direction.

[0058] like Figure 2 As shown, preferably, the moving mold structure 2 includes a moving template 21, on which an installation groove 22 is provided. The installation groove 22 passes through the moving template 21 along the moving direction of the linkage rod 324. The linkage rod 324 and the linkage plate 321 move within the installation groove 22. The linkage roller 323 is used to extend into the installation groove 22 and contact the inclined surface 322.

[0059] Specifically, when the linkage roller 323 extends into the mounting groove 22 and contacts the lower end of the inclined surface 322, the lower end surface of the push plate 20 fits against the upper end surface of the moving template 21, which helps to ensure a tight fit of the mold and thus improves the quality of the injection molded product 4.

[0060] During demolding, the hydraulic cylinder 311 drives the threaded core 33 to rotate, and simultaneously drives the linkage rod 324 and the linkage plate 321 to move within the mounting groove 22, so as to cooperate with the linkage roller 323 to drive the push plate 20 and the injection molded product 4 to move upward. In this structure, the mounting groove 22 provides space for the movement of the linkage rod 324 and the linkage plate 321, so as to facilitate the tight fit of the mold components.

[0061] like Figure 5 As shown, preferably, the drive assembly 31 further includes a rack 312, a first gear 313, a second gear 314, and a third gear 315. The movable end of the cylinder 311 is connected to the rack 312. The rack 312 meshes with the first gear 313. The second gear 314 is coaxially arranged with the first gear 313, and the third gear 315 meshes with the second gear 314. The threaded core 33 is connected to the third gear 315.

[0062] During demolding, the hydraulic cylinder 311 is activated, and the movable end of the hydraulic cylinder 311 drives the rack 312 to move. The rack 312 drives the first gear 313 to rotate, and the second gear 314 rotates synchronously, thereby driving the third gear 315 to rotate. The threaded core 33 rotates under the drive of the third gear 315, thus demolding.

[0063] The tilt angle of the inclined surface (322) is determined based on the pitch of the threaded core (33) and the travel of the rack (312).

[0064] Specifically, in this application, the injection-molded product is an oil can handle cover. During the design, it is known that the pitch of the thread core 33 is 4.0, and the transmission ratio of the second gear 314 and the third gear 315 is 1:2. In this application, the number of teeth of the second gear 314 is 70, and the number of teeth of the third gear 315 is 35.

[0065] The pitch circle diameter of the second gear 314 is φ50mm, and the circumference is 157mm.

[0066] For every one revolution of the threaded core 33, the first gear 313 needs to rotate 0.5 revolutions.

[0067] Therefore, for the threaded core 33 to rotate one revolution, the rack 312 needs to advance forward a distance of: the circumference of the second gear 314 * 0.5, that is, 157 * 0.5 = 78.5 mm.

[0068] As the threaded core 33 rotates one revolution, the linkage plate 321 must simultaneously push the push plate upward by 4.0mm.

[0069] Therefore, the angle α of the inclined surface 322 on the linkage plate 321 is α = arctan(78.5 / 4.0) = 2.9°.

[0070] This angle calculation is only one specific embodiment. The present invention is not limited to this specific value. Any inclined surface design that can achieve synchronous ejection and rotational demolding falls within the protection scope of the present invention.

[0071] like Figures 3-4 As shown, preferably, the threaded core 33 is provided with an inner groove 331 through its axial direction, and a moving mold insert 23 is provided in the inner groove 331. The upper end of the moving mold insert 23 extends from the upper end of the inner groove 331 to protrude the threaded core 33, and the lower end of the moving mold insert 23 is used to fix it in the moving mold structure 2.

[0072] Specifically, the injection molded product 4 in this application is an oil can handle cover. The moving mold insert 23 is used to injection mold the oil can spout 43 on the oil can handle cover. The oil can spout 43 is located at the upper end of the cover body 42. Therefore, the moving mold insert 23 is located inside the threaded core 33, with its upper end extending out of the threaded core 33. The threaded core 33 can rotate relative to the moving mold insert 23.

[0073] like Figures 3-4 As shown, preferably, the fixed mold structure 1 includes a fixed template 11 and a fixed mold core 12 disposed within the fixed template 11; the moving mold structure 2 further includes a moving mold core 26 and a mounting base 24. The moving mold core 26 is located within the moving template 21, and the moving template 21 is located on the mounting base 24. A mounting hole 25 is provided through the middle of the moving mold core 26. The upper end of the threaded core 33 extends from the mounting hole 25 to the space between the fixed mold core 12 and the moving mold core 26. The threaded end 332 of the threaded core 33, the upper end of the moving mold insert 23, the fixed mold core 12, and the moving mold core 26 form the injection cavity 10.

[0074] Specifically, the moving mold insert 23 extends between the moving mold core 26 and the fixed mold core 12, and the moving mold insert 23 and the inner groove 331 are circumferentially rotatable and connected.

[0075] The third gear 315 has a core hole in the middle. The threaded core 33 is fixedly connected to the third gear 315 through the core hole. The threaded core 33 is rotatably mounted on the moving mold core 26, the moving mold plate 21 and the mounting base 24 through a bearing. The lower end of the moving mold insert 23 is fixed on the mounting base 24 through a fixing seat.

[0076] In this structure, the hydraulic cylinder 311, the rack 312, the first gear 313, the second gear 314, and the third gear 315 cooperate with each other to rotate the threaded core 33. Simultaneously, the movable end of the hydraulic cylinder 311 drives the linkage plate 321 to move horizontally, so that the linkage plate 321 pushes the push plate 20 and the injection molded product 4 to move vertically, thereby demolding. This structure utilizes the hydraulic cylinder 311 to simultaneously drive the threaded core 33 and the linkage plate 321, realizing the action of simultaneously reaming the thread and pushing the plate out. Not only is the structure relatively simple, which helps to reduce production costs, but also, due to synchronous demolding, it ensures the accuracy of the starting position of the product thread, solving industry pain points such as easy damage to the product's tail thread, easy damage to the thread sleeve, and seizing. It can effectively prevent the thread from being damaged, which is conducive to improving the thread quality, that is, improving the quality of the injection molded product 4.

[0077] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A synchronous threaded demolding mold, comprising a fixed mold structure (1), a moving mold structure (2), and a demolding mechanism (3), wherein an injection cavity (10) is formed between the fixed mold structure (1) and the moving mold structure (2), characterized in that: The moving mold structure (2) includes a push plate (20), and the injection molded product (4) formed in the injection cavity (10) is located on the push plate (20); The demolding mechanism (3) includes a drive assembly (31), a linkage assembly (32), and a threaded core (33). The threaded core (33) extends into the injection cavity (10), and the drive assembly (31) is used to drive the threaded core (33) to rotate. The linkage component (32) is connected to the drive component (31). The linkage component (32) includes a linkage plate (321), which is movably connected to the push plate (20). The drive component (31) is used to drive the linkage plate (321) to move so that the linkage plate (321) pushes the push plate (20) to move so as to push the injection molded product (4) off the threaded core (33).

2. The synchronous threaded demolding mold according to claim 1, characterized in that, The moving direction of the linkage plate (321) is the first direction, and the upper surface of the linkage plate (321) is an inclined surface (322). When the inclined surface (322) moves with the linkage plate (321) in the first direction, it pushes the push plate (20) to move in the second direction.

3. The synchronous thread demolding mold according to claim 2, characterized in that, The linkage component (32) also includes a linkage roller (323). The lower end of the push plate (20) is provided with a linkage roller (323) opposite to the inclined surface (322). The linkage roller (323) is used to roll on the inclined surface (322).

4. A synchronous threaded demolding mold according to claim 3, characterized in that, The linkage assembly (32) further includes a linkage rod (324), and the linkage plate (321) is fixed on the linkage rod (324); the drive assembly (31) includes a hydraulic cylinder (311), and one end of the linkage rod (324) is connected to the movable end of the hydraulic cylinder (311).

5. A synchronous threaded demolding mold according to claim 4, characterized in that, Two linkage plates (321) are arranged sequentially along the length of the linkage rod (324), and the inclined surfaces (322) of the two linkage plates (321) are arranged in parallel; correspondingly, two linkage rollers (323) are also arranged, and the linkage rollers (323) are used to roll from the lower end of the inclined surface (322) to the higher end.

6. A synchronous threaded demolding mold according to claim 4, characterized in that, The moving mold structure (2) includes a moving template (21), on which an installation groove (22) is provided. The installation groove (22) passes through the moving template (21) along the moving direction of the linkage rod (324). The linkage rod (324) and the linkage plate (321) move within the installation groove (22). The linkage roller (323) is used to extend into the installation groove (22) and contact the inclined surface (322).

7. A synchronous threaded demolding mold according to claim 6, characterized in that, When the linkage rod (324) and the linkage plate (321) are located in the mounting groove (22), the higher end of the inclined surface (322) is flush with the upper opening of the mounting groove (22).

8. A synchronous threaded demolding mold according to claim 6, characterized in that, The drive assembly (31) further includes a rack (312), a first gear (313), a second gear (314), and a third gear (315). The movable end of the cylinder (311) is connected to the rack (312). The rack (312) meshes with the first gear (313). The second gear (314) is coaxially arranged with the first gear (313), and the third gear (315) meshes with the second gear (314). The threaded core (33) is connected to the third gear (315).

9. A synchronous threaded demolding mold according to claim 8, characterized in that, The threaded core (33) is provided with an inner groove (331) through its axial direction. A moving mold insert (23) is provided in the inner groove (331). The upper end of the moving mold insert (23) extends from the upper end of the inner groove (331) to protrude from the threaded core (33). The lower end of the moving mold insert (23) is used to fix it in the moving mold structure (2).

10. A synchronous threaded demolding mold according to claim 9, characterized in that, The fixed mold structure (1) includes a fixed template (11) and a fixed mold core (12) disposed in the fixed template (11); the moving mold structure (2) further includes a moving mold core (26) and a mounting base (24). The moving mold core (26) is located in the moving template (21), and the moving template (21) is located on the mounting base (24). A mounting hole (25) is provided through the middle of the moving mold core (26). The upper end of the threaded core (33) extends from the mounting hole (25) to the space between the fixed mold core (12) and the moving mold core (26). The threaded end (332) of the threaded core (33), the upper end of the moving mold insert (23), the fixed mold core (12), and the moving mold core (26) form the injection cavity (10).

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